Advisory Details

January 3rd, 2020

Cisco Data Center Network Manager SecurityManager Hard-coded Cryptographic Key Authentication Bypass Vulnerability

ZDI-20-008
ZDI-CAN-9140

CVE ID CVE-2019-15976
CVSS SCORE 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Cisco
AFFECTED PRODUCTS Data Center Network Manager
VULNERABILITY DETAILS

This vulnerability allows remote attackers to bypass authentication on affected installations of Cisco Data Center Network Manager. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the validation of SSO tokens of SOAP packets. The issue results from the use of a hard-coded key to validate the message digest. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of SYSTEM.

ADDITIONAL DETAILS Cisco has issued an update to correct this vulnerability. More details can be found at:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200102-dcnm-auth-bypass
DISCLOSURE TIMELINE
  • 2019-08-13 - Vulnerability reported to vendor
  • 2020-01-03 - Coordinated public release of advisory
CREDIT Steven Seeley (mr_me) of Source Incite
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